Still from American Sniper. The comic is never named, but if you look closely, you can see that it's issue No. 1 of the sixth volume of Punisher, released in January of 2004 (making it very believable as something Biggles could be reading during the platoon's 2004 deployment).
A Dr. Garry Choy, MD, Diagnostic Radiology, answered. Radiation fibrosis is the result of prior radiation exposure that results in scarring of an organ such as breasts, lungs, etc. Post radiation treatment fibrosis is the typical cause.
Although very rare, scar tissue from burns may develop into cancer. Several sources cite burn scar carcinoma from a Marjolin's ulcer. Thermal burns may develop into these Marjolin's ulcers with malignant transformation. In fact, these ulcers may develop from chronic wounds, chronic venous ulcers, burn scars, pressure sores, osteomylelitis, radiation scars, and urinary fistulas.